References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-12-8499-2012

Modelling of organic aerosols over Europe (2002–2007) using a volatility basis set (VBS) framework: application of different assumptions regarding the formation of secondary organic aerosol

Bergström

¹ ² Denier van der Gon

H. A. C.

³ Prévôt

A. S. H.

⁴ Yttri

K. E.

⁵ Simpson

⁶ ⁷

Department of Chemistry and Molecular Biology, University of Gothenburg, 41296 Gothenburg, Sweden

Swedish Meteorological and Hydrological Institute, 60176 Norrköping, Sweden

TNO Netherlands Organisation for Applied Scientific Research, Utrecht, The Netherlands

Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, Villigen, Switzerland

Norwegian Institute for Air Research, Kjeller, Norway

EMEP MSC-W, Norwegian Meteorological Institute, Oslo, Norway

Dept. Earth & Space Sciences, Chalmers Univ. Technology, Gothenburg, Sweden

21 09 2012

12 18 8499 8527

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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A new organic aerosol module has been implemented into the EMEP chemical transport model. Four different volatility basis set (VBS) schemes have been tested in long-term simulations for Europe, covering the six years 2002–2007. Different assumptions regarding partitioning of primary organic aerosol and aging of primary semi-volatile and intermediate volatility organic carbon (S/IVOC) species and secondary organic aerosol (SOA) have been explored. Model results are compared to filter measurements, aerosol mass spectrometry (AMS) data and source apportionment studies, as well as to other model studies. The present study indicates that many different sources contribute significantly to organic aerosol in Europe. Biogenic and anthropogenic SOA, residential wood combustion and vegetation fire emissions may all contribute more than 10% each over substantial parts of Europe. This study shows smaller contributions from biogenic SOA to organic aerosol in Europe than earlier work, but relatively greater anthropogenic SOA. Simple VBS based organic aerosol models can give reasonably good results for summer conditions but more observational studies are needed to constrain the VBS parameterisations and to help improve emission inventories. The volatility distribution of primary emissions is one important issue for further work. Emissions of volatile organic compounds from biogenic sources are also highly uncertain and need further validation. We can not reproduce winter levels of organic aerosol in Europe, and there are many indications that the present emission inventories substantially underestimate emissions from residential wood combustion in large parts of Europe.

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